Hope this doesn't further belabor the issue, but just to put my
two cents in, Perl syntactic rules for prefixing "$", "@", "%" are
very consistent, IMHO: You just need to keep in mind the types of
the values/data types ultimately being expressed, and it should
become clearer. "$" always prefixes scalars or references, "@"
always prefixes lists, and "%" always prefixes associative arrays
(a.k.a hashes).
@array is a list
$array[n] is a scalar/reference
%hash is a hash
$hash{'key'} is a scalar/reference
@$ref dereferences a reference to an array, accessing the array In
this case, "print $ref;" would give you a reference scalar,
something like "ARRAY(0x4E3FB1C)"; "print @$ref;" would output the
actual array list.
Also try @hash{keys %hash}, which returns a list of the hash's
values.
In all these cases, the prefixed "sigils" consistently describe
the data type ultimately expressed, rather than the data type of
the originating variable's data structure.
Kevin
-- Original Message --
From: "Octavian Rasnita" <[EMAIL PROTECTED]>
Date: Wed, 18 Dec 2002 20:13:58 +0200
>@var is an array
>$var is a scalar
>
>$var[0] is also a scalar even though is an array element.
>@var[0] is an array which contains more array elements, but in
this case it
>contains just a single element.
>
>To create an array slice with more elements, you'll need
something like
>@var[0 .. n]
>
>You need to always use $ for scalars and @ for arrays.
>
>
>Teddy,
>Teddy's Center: http://teddy.fcc.ro/
>Email: [EMAIL PROTECTED]
>
>- Original Message -
>From: "Lance Murray" <[EMAIL PROTECTED]>
>To: <[EMAIL PROTECTED]>
>Sent: Wednesday, December 18, 2002 7:02 PM
>Subject: Confusion on @array vs $array[] vs $array
>
>
>Hello:
>
>I have been fairly confused on the intermixing of array naming
standards.
>If I
>understand correctly, the @array syntaxt is used to refer to the
whole
>array,
>while $array[n] is refered to specific elements.
>
>In my thinking, it would have been less confusing to use @array
[n] to
>address
>specific elements, but Perl complaines bitterly when warnings
&/or strict is
>enabled.
>
>Is the rational for the "$"array[] character for
identifying "@"array
>elements
>due to the fact that the $ character has special meaning (denotes
variable
>or
>element) within double quoted text, while the @ sign has no
special meanign
>within double quotes.
>
>Anyway, perhaps one of you syntactical thought police could give
me some
>insights to the rational. I find it very confusing that the $
and @
>characters
>are supposed to be used interchangeably to denote arrays,
particularyly when
>I'm
>trying to fathom the relation to other issues such as scalar or
list
>context.
>As I recall, hashes arso use % and @ interchangeably.
>
>Thanks,
>
>Lance
>
>--
--
>--
>#!/usr/bin/perl
>print "Lance Murray, Information and Communications Systems\n", #
>department
>"The Church of Jesus Christ of Latter-Day Saints\n", # employer
and
>religion
>"(801) 240-6583, murraylk\@ldschurch.org\n\n", # work phone
number and
>email
>"\"Better to do a little well than a lot poorly (Socrates)\"\n"; #
>philosophy
>@P=split//,".URRUU\c8R";@d=split//,"\nrekcah xinU / lreP rehtona
tsuJ";sub
>p{
>@p{"r$p","u$p"}=(P,P);pipe"r$p","u$p";++$p;($q*=2)+=$f=!fork;map
{$P=$P[$f^or
>d
>($p{$_})&6];$p{$_}=/
>^$P/ix?$P:close$_}keys%p}p;p;p;p;p;map{$p{$_}=~/^[P.]/&&
>close$_}%p;wait until$?;map{/^r/&&<$_>}%p;$_=$d[$q];sleep
>rand(2)if/\S/;print
>
>--
--
>--
>This message may contain confidential information, and is
intended only for
>the use of the individual(s) to whom it is addressed.
>
>
>==
==
>==
>
>
>
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>
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